There's no denying that the Go 540 Live packs and incredible amount of technology and features into a relatively sleek (127x85x23mm, 224g) unit. The unit is relatively easy to use (except for figuring out how to lower the ear-piercing voice navigation!), and is largely effective in reducing the burden on the driver. The 4.3-inch widescreen display (WQVGA: 480x272 pixels) is easy to read, though some may find there is a too much information on screen, and the battery provides a reasonable 3 hours' autonomous operation between charges - should you not keep it constantly docked to your cigarette lighter. As expected, Bluetooth is present so you can make and receive hands-free calls, and the included PC software lets you download recent user-generated corrections via TomTom's Map Share service. Our biggest gripe was that the Go 540 Live failed to pick out the fastest routes on our test runs. Instead of taking us down relatively quiet dual carriageways, it decided that desolate country lanes and constant left/right turns were the most appropriate. We also begrudge paying any kind of ongoing subscription for a device that already costs a premium. If, unlike us, you're not bothered about cost and want the latest and greatest functionality - regardless of whether or not you'll use it - the Go 540 Live is the one to go for. If plain and simple navigation is all you're after, save some money and opt for a cheaper alternative.